<div class="content" *ngIf="condition else elseTemplate">
    判断条件为真
</div>
<ng-template #elseTemplate>
    <div class="content">判断条件为假</div>
</ng-template>

<div>
    <app-sys-button [options]="options" (btnClick)="btnClick()"></app-sys-button>
</div>